The crossword solutions for the term PARTNER OF FAST are HARD (4 letters) and LOOSE (5 letters). The term 'PARTNER OF FAST' is often used to describe a situation in which two people or entities work together to achieve a common goal. In this case, HARD and LOOSE are two words that can be used to describe the relationship between the two parties. HARD implies that the two parties are working together in a very structured and organized manner, while LOOSE implies that the two parties are working together in a more relaxed and informal way.